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由 Hans Verkuil 提交于
The locking scheme inside the vb2 thread is unsafe when stopping the thread. In particular kthread_stop was called *after* internal data structures were cleaned up instead of doing that before. In addition, internal vb2 functions were called after threadio->stop was set to true and vb2_internal_streamoff was called. This is also not allowed. All this led to a variety of race conditions and kernel warnings and/or oopses. Fixed by moving the kthread_stop call up before the cleanup takes place, and by checking threadio->stop before calling internal vb2 queuing operations. Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com> Cc: <stable@vger.kernel.org> # for v3.16 and up Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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